OEM 66340 OSRAM D3S Xenon HID Headlight Bulb - OEM 4300K Brightness

Our review of the OEM 66340 OSRAM D3S Xenon HID Headlight Bulb finds it best for drivers seeking a direct factory replacement with a true OEM color temperature and reliable long-term performance. The single biggest reason to buy is the exact OEM specification: a 4300K color that closely matches original equipment light output and color, providing a natural daylight appearance and improved on-road visibility without color mismatch. This review focuses on fit, light quality, and real-world use rather than marketing claims.

Key Features

• Exact OEM fit: The D3S 66340 is an original equipment part designed to replace the factory bulb without modification, ensuring proper fit and light aiming.
• 4300K color: The near-daylight 4300K color temperature reduces eye fatigue and produces a neutral white beam that matches many factory housings.
• 35W power: Rated 35W at 42V, the bulb delivers the expected intensity for Xenon HID systems while remaining within OEM electrical parameters.
• Made in Germany: The Xenarc original construction and German manufacturing provide durable components and consistent light output over time.
• DOT compliant and mercury free: Meets OEM regulatory expectations for road use and reduces environmental concern compared with older mercury-containing designs.
• Pack of 1: Sold as a single replacement bulb, useful for staged replacements when only one headlamp needs swapping.

Who It's For

This bulb is ideal for drivers whose vehicle originally shipped with a D3S lamp and who want a like-for-like replacement with a 4300K color match and OEM performance. It suits owners of European and other vehicles that require exact Xenarc OEM parts and who prefer parts made in Germany with a manufacturer guarantee.

It is not for drivers with D1S or D8S systems, as the package notes the D3S is not interchangeable with those types. Also, anyone looking for dual-pack convenience or aftermarket high-output conversions should look elsewhere; this product is a single OEM-spec replacement rather than a modified high-output accessory.

Pros & Cons

Pros

• Accurate OEM color match and brightness that customers report as matching factory output and improving night visibility.
• Consistent build quality and reliability from the Xenarc original line with a manufacturer guarantee for added confidence.
• DOT compliance and mercury-free construction for legal road use and lower environmental impact.

Cons

• Sold as a single bulb, so replacing both sides requires purchasing two units.
• Some users report mixed ease of installation, so professional installation is recommended for those unfamiliar with Xenon headlamp service.

Specifications

Brand	OSRAM Xenarc Original
Model / Part	OEM 66340 D3S
Color Temperature	4300K OEM
Power	35W, 42V
Quantity	Pack of 1
Compliance	DOT compliant, mercury free
Made in	Germany

Our Verdict

The OEM 66340 OSRAM D3S is a practical choice for owners who need an exact factory replacement with reliable light quality and OEM color match. It represents good value for those prioritizing correct specification and longevity over aftermarket brightness hacks, though buyers should be aware it is a single bulb and professional installation is recommended if uncertain about handling Xenon systems.

Frequently Asked Questions

Is this bulb interchangeable with D1S or D8S?
No, the D3S 66340 is not interchangeable with D1S or D8S and must be used only in compatible D3S housings.

Does it include a trust code or security tag?
This OEM Xenarc product comes in an eco package box and does not include a trust code on the package.

Should I install it myself?
XENARC lamp replacement is recommended to be carried out by a professional; some users find installation straightforward, but experiences vary.